need help from native English speakers!

well... again little Luci is sitting here, has nothing to do and is looking for new business ideas. So she stumbled over the idea to make some t-shirt designs and add a little shop to the Metal Travel Guide pages.

So anyway, now I´m thinking about some shirt designs and a bit of text which has at least _something_ to do with the topic Metal & Travelling.
Now in German, I would write something like "Reisender in Sachen Metal" or "Botschafter in Sachen Metal" , but - how do you translate that? Its kind of a German saying so I´m not sure.
Can you say "Traveller in the name of Metal"? And do you write traveler or traveller? I´ve seen both...
mono also suggested "Herald in the name of Metal", how does that sound to your ears? I can´t judge...
He also suggested me to ask what you think about "Metal ambassador" - does that sound incredibly stupid or incredibly cool? Or is there already a band called Metal Ambassador?
HELP!
Other ideas of course are welcome too!